Migrate actions logic to a Python package

[da1910]

There are now several actions that have dependences and extensive python code as multiline literals in a workflow file. These can't be tested, and won't be properly covered by dependabot etc for their dependencies.

Can we please get these into a repo, built into a proper package and distributed via pip correctly? Something like ansys.actions.scripts or similar?

[jorgepiloto]

Thanks for raising this discussion, @da1910. I think this is a great approach. In addition, I would like to keep such package in this same repository.

This would also allow us to take advantage of tools like semver to solve old issues like #217.